The Caretium Electrolyte Analyzer (such as the XI series) is an automated laboratory diagnostic device designed to rapidly measure concentration levels of key electrolytes—primarily Sodium (\text{Na}^+), Potassium (\text{K}^+), Chloride (\text{Cl}^-), Calcium (\text{Ca}^{2+}), Lithium (\text{Li}^+), and \text{pH}—in blood, serum, plasma, or urine samples using Ion-Selective Electrode (ISE) technology.